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Hint: use the SD-Card 1bit mode trick described on GPIO4 to use this pin!.Signal: EMAC_RX_CLK - Ethernet MAC MII/RII interface.strapping pin - ESP32_S datasheet, default:pull-up w/GPIO5 controls Timing of SDIO slave (see documentation).CSI_D0 esp_camera.h:CAM_PIN_D0 -> Camera FPC Y2.enable SD_MMC in menuconfig > Arduino section 1-bit SD Card 'hack' initialize the microSD card as follows, then the microSD card won’t use the GPIO4, GPIO12, GPIO13 data lines (HS_DATA1, HS_DATA2, HS_DATA3 respectively)!.listed in ESP32_S datasheet as "RTC_Function2" I2C_SCL.Signal: EMAC_TX_ER - Ethernet MAC MII/RII interface.ADC2_CH0- 12bit SAR ADC, Supports SD Memory Card v3.01.Supports Capactive Sensing T0 (see ESP32_S datasheet section 4.1.5 "Touch Sensor").might be usable as a SPI MOSI (need to verify).connected to onboard 3030 SMD LED (Flashlight).has a 47Kohm resistor (R11) on the SD1/MicroSD line.Signal: EMAC_RXD2 - Ethernet MAC MII/RII interface.designated as a (wpd) "weak pull down" by ESP32_S datasheet v3.4 pg53 IO/Mux Addendum.ADC2_CH2- 12bit SAR ADC, SD Memory card v3.01.Supports Capactive Sensing T2 (see ESP32_S datasheet section 4.1.5 "Touch Sensor").
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strapping pin - ESP32_S datasheet, default:pull-down - must be down to download boot on GPIO0).designated as a (wpu) "weak pull up" by ESP32_S datasheet v3.4 pg53 IO/Mux Addendum.listed in ESP32_S datasheet as "RTC_Function2" I2C_SDA.Signal: EMAC_TX_CLK - Ethernet MAC MII/RII interface.Supports Capactive Sensing T1 (see ESP32_S datasheet section 4.1.5 "Touch Sensor").strapping pin - ESP32_S datasheet, default:pull-up spi-boot:1, download-boot:0.CSI_MCLK is used by Camera (line 12 on FPC).Internally has a 3.3v 10k pullup resistor (R19).Pull to ground (at reset) to put board into flash mode.However pins listed as "not exposed" could be accessible using a soldering iron, or a custom FPC in the camera interface. not exposing the I2C pins) significantly cripple the possible applications. To make matters a bit more confusing the layout seems to be done by a inebriated engineer or (more likely) a trace auto-router. You'll discover most of the pins on the ESP32 cam are already used or have wonky behaviors.
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